Data being ****** EVERY month

So here we go again. It is exactly 10 days after I received my monthly data, and I am on low data. And vodacom does not respond, sort this out or are willing to assist me. Must I do it every month for the next year because I am only a client? I am not allowed to make changes to my account, and Vodacom can change my billing amount as they like, allow people to ***** my data, and I dont get what I pay for. I am fedup. Sort this out now. I am losing clients because I cannot rely on my data to work!!! And I will never again use Vodacom!